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Abstract

Observational evidence is presented to show an atmospere-ocean coupled system in the maturing process of the Asian summer monsoon (ASM) and the western Pacific monsoon (WPM). The ASPM and WPM are characterized by 4 abrupt seasonal changes that exhibit phase-locking features in the annual cycle. Over the Indian Ocean, the seasonal increase of sea surface temperature (SST) follows the solar insolation and reduced evaporative cooling as well. In contrast, increase of SST over the subtropical western Pacific (SWP) lags behind those in the Indian Ocean by about one month